Figure 4. Area cartograms showing the sizes of countries in proportion to A) the number of smokers* and B) the number of RCTs (RCTs included in Cochrane systematic reviews and ongoing RCTs) aimed at reducing or stopping tobacco use^†.

* Source: World Bank's 2005 World Development Indicators, 2005. Table 2.18 Health: risk factors and future challenges. The World Bank sourced this in turn from the World Health Organization's 2004 World Health Report, Tobacco Control Country Profiles 2003. ^† The number of RCTs (primary and ongoing) was classified by main regions according to the 2008 World Bank classification: high-income countries, East Asia and Pacific, Eastern Europe and Central Asia, Latin America and Caribbean, Middle East and North Africa, South Asia, Sub-Saharan Africa. For the construction of the map we divided the number of trials performed in each region by the number of countries in each region.